Malicious PDF — malware analysis report

Static analysis result for SHA-256 3514c30d16566f18…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 20:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 527855295a1df8972a2b21068da2c838 SHA-1: 898b88d8a5cff9cfb4032769b058714a6d4eeaa9 SHA-256: 3514c30d16566f1880338f4f2d30aacdc9f9a9b888815b8645506a3daea30f11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kimyasaldubeller.com/upload/ckfinder/files/82480294759.pdf In PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/7193v2ljsn0lh9bl1cbu90jqv5/60322931186.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac02fce488---riwejovarirebeloku.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/dovudepigulunupokerogez.pdfIn PDF document text
    • http://envigest.cz/upload/file/ferudewaniwux.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wawipuretejofunujupitox.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/94857294069.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1bbba9b9---tolelewanidazolurewetub.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/96898297036.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/gagiburokev.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae201201283---jixipekuwegoso.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e21644f07---37541208826.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/43013341141.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12463073855.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa6ec80ef---gisedazotew.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1b4ba967edc9494fe0e89c0d32059e7e/kusumawoxovumaf.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082851f8c565---migolonone.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/jilokojufaw.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9ncstr65rfjgsu1l0gs39qg91o/44430190895.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc595ee61e---62506118388.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/bevez.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1a792c51b834e65a558613deb843d586/28865374557.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/83696574711.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160725db956248---teroxufotakikobisadeku.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d9d44c12d488bed4a07410f8376f65cf/nakorepaluv.pdfIn PDF document text
    • http://pneusmarene.it/images/file/88303711242.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/digavafoxuzezizejula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=itchy+dry+penisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 16596 bytes
SHA-256: df8ec0a2f2928706e1b655e950241db190b7c001e4c833cae052ed20811adbe2
font_01_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 10348 bytes
SHA-256: 9e954c55055f2bf96bca37cebf2f0fc25391a0d68ff5dc5bcf96da2778e9dbda
font_02_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1